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XXXII. Experiments and Obfervations on 
the Waters of Buxton and Matlock, in 
Derby fhire, by Thomas Percival, of Man- 
chefter, M. D. and F. R. S. 
Read June 25 , t I^HE water of faint Ann’s- well is 
1 77 2, J_ found, by analyfis, to contain cal- 
careous earth, foffil- alkali, and fea falts ; but in 
very ftnall proportions : for a gallon of the water, 
when evaporated, yields only twenty three, or twenty 
four grains of fediment. It ftrikes a light green 
colour with fyrup of violets, fuffers no change from 
an infufion of galls, from the fixed vegetable alkali, 
or from the mineral acids j becomes milky with the 
volatile alkali, and with Saccharum Saturni ; and lets 
fall a precipitate on the addition of a few drops of 
a folution of filver, in the nitrous acid. The fpecific 
gravity of this water is precifely equal to that of rain 
water, when their temperatures are the fame ; but 
it weighs four grains in a pint lighter, when firfl 
taken from the fpring. The heat of the bath is 
about 82 degrees of Fahrenheit’s thermometer ; that of 
Saint Ann’s well, as it is a fmaller body of water, and 
expofed to the open air, is fomewhat lefs. The water 
is tranfparent, fparkling, and highly grateful to the 
palate *. 
* I am indebted to the information of the worthy phyfician: 
v/ho attends at Buxton, for fome of thefe fads. 
In 
